Endgames

Statistical question

Statistical significance and confidence intervals

BMJ 2009; 339 doi: 10.1136/bmj.b3401 (Published 2 September 2009)
Cite this as: BMJ 2009;339:b3401

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  1. Philip M Sedgwick, senior lecturer
  1. 1St George’s Hospital, University of London, London SW17 0RE
  1. p.sedgwick{at}sgul.ac.uk

    A prospective population based cohort study investigated the association between occupation and pregnancy outcome for mothers who had missed antenatal visits. The mean birth weight was 3371 g (95% confidence interval 3274 to 3469) and 3227 g (3140 to 3315 g) for babies born to mothers in non-manual and manual jobs, respectively.

    On the basis of the above information, which of the following can be deduced for mothers who missed antenatal visits?

    • a) In the population, 95% of mothers with a non-manual occupation have a baby with a birth …

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